CVE-2026-49253
HighCVSS 7.1Summary
electerm prior to version 3.11.11 uses remote-supplied filenames directly with path.join() while receiving Zmodem and Trzsz transfers. A malicious SSH server can provide a filename containing traversal components such as ../, allowing writes outside the selected download directory and overwriting files accessible to the desktop user. This issue is fixed in version 3.11.11.
Risk Assessment
The attack can lead to overwriting sensitive configuration files or other user data, potentially compromising system integrity or causing unavailability.
Recommendation
Update electerm to version 3.11.11 or later.
Original NVD description (English source)
electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to 3.11.11, electerm uses remote-supplied filenames directly with path.join() while receiving Zmodem and Trzsz transfers. In src/app/server/zmodem.js, prepareReceiveFile() joins the filename to the user-selected save path, and in src/app/server/trzsz.js, getUniqueFilePath(), the openSaveFile() callback, and the savedFilePaths mapping construct destinations without sanitization. A malicious SSH server or remote shell can provide a filename containing traversal components such as ../escaped.txt or ../../.bashrc. When the victim accepts the transfer and selects a download directory, electerm can write outside that directory and overwrite files accessible to the desktop user, potentially changing sensitive configuration or impairing availability. This issue is fixed in version 3.11.11.